Furnace-grate.



Patented Aug. 7, |900. H THUESDELL FURNACE GHATE. (Applcmon led Apr, s, A1899 l 2 Shets-Sheef l.

(No Model.)

Figi] rTED STATES PATENT Orme HENRY TRUESDELL, OF TORONTO, CANADA, 'ASSIGNOR`TO THE OYOLONE GRATE BAR COMPANY, LIMITED, OF SAME PLACE.

FU RNACE-G RATE.

SPECIFICATION forming partof Letters Patent No. 655,663, datedAugust '7, 1900'. Applicationnednprn 3,1899. sentire. 712,344.. (remodel.)

To all whom it may concern:

Be it known that I, HENRY TRUESDELL, of the city of Toronto, in the county of York and Province of Ontario, Canada, have invented certain new and useful Improvements in Furnace-Grates; and I hereby declare that the following is a full, clear, and exact description of the same.

This invention relates to a furnace-grate in which will be combined durability, economy of fuel, and simplicity of operation.

Unless a practicallyperfect combustion takes place within the furnace a consequent loss of fuel is the result, with a corresponding loss of heat. To obtain this perfect combustion, it is necessary to so arrange the gratebars that they can be kept thoroughly cleanthat is to say, free from ashes and clinkers`` and to so arrange them that air currents or drafts can have free access to the fire.

To so construct a furnace-grate that a practically-perfect combustion can be obtained and to so arrange the grate-bars that they can be cheaply and economically made and repaired and simply operated is the object of the present invention, which consists of a furnace-grate embracing in its construction a plurality of independent grate-bars, each consisting of a substantiallyrectangular frame, a plurality of independent sections removably mounted on the sides of the frame,

which are trussed to allow of the free circulation of the air-currents and towithstand the ordinary strains to which the grate-bar is subjected, and a gudgeon for each end of the grate bar, so formed that it will revolubly and removably interlock with the bearings of the journal-plates, the end of each grate-bar being connected to an operating bar lor rod moved by a lever to rock the grate-bars to disintegrate the coal in the furnace and free the furnace from ashes or to place the gratebars in such a position that the contents of the furnace can be dumped into the ash-pit, as hereinafter more fully set forth, and more particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of aportion of the furnace of a boiler,

' ends of the sides a ot.

showing the relative position of the several parts of the furnace-grate. Fig. 2 is a perspective view of one of the grate-bars. Fig. 3 is a perspective view of the frame of the grate-bar. Fig. 4t is a perspective viewof one of the removable sections of thegrate-bar. Fig. 5 is a perspective viewof oneof the journal-plates. Fig. 6 is a perspective view from the inner side of the front support and journal-plates. Fig. 7 is a side elevation showing the mechanism for rocking the grate-bars. Like letters of reference refer to like parts throughout the specification and drawings.

A A represent the grate-bars, each of which consists of a substantially-rectangular frame A, a plurality of independent sections A, removably mounted on the sides of the frame A', and gudgeons A3, integrally formed with the middle of the ends of the frame A. The frame A consists of two opposite sides a a and ends at a', integrally formed with the The lower edge of each of the sides au is arched to form. a truss a to enable the sides to support the weight of the grate-bar and the Weight of its proportionate share of the contents of the furnace without bending. Each of the ends ct' a projects beyond the outer faces of the sides a a to form the Vend sections of the grate-bars, and the lower edge of each of the ends a a is arched, to form a convexed truss, while the top a3 of each of the ends a a is conveXed and is provided with lateral corrugations B to allow of the air-currents passing longitudinally along the grate-bar and with longitudinal corrugations O to allow ofthe aircurrents passing laterally across the gratebar. Each of the sections A is equal in length to the length of the ends a a', and the top of each of the sections A is convexed or arched to correspond to the arch of the top of the ends a ct and is provided with lateral corrugations B and longitudinal corrugations O, corresponding to the corrugations of the ends a. a. Projecting inwardly from the lower edge of each of the sections A are two notches D, equal in width to the thickness of the sides ot a and arranged equidistant from 'ness of the sections A and receive the sections when they are assembled in position, the sides of the notches D embracing the sides of the sections A, while the sides of the notches D embrace the inner and outer faces of the sides a a of the frame, thus enabling the sections A" to be removably locked in position on the sides a a. The notches D D are of such'a depth that when the sections are locked in position the top of the sections will be approximately in the same plane as thejtop of the sides a ce. That part of the sidesc a. between each adjacent pair of sections A is concaved to admit of the air-currents passing intol the furnace between the sides of the sections. The lower edge of each of the sections A between the notches D is concaved to provide a passage for the aircurrentsbelow the grate-bar and also to assist the sections in resisting compression.

By trussing the sides and ends of the frame and the sections the compression of the variousparts by the weight upon them is resisted. Consequently a greater strength is obtained fromy the same quantity of metal for a gratebar of this construction than if the parts were not trussed.

By making the sections removable and locking them in position in the manner above described it is possible in the case of injury to one or more of the sections to remove the injured section or sections and replace it or them with new ones without disturbing any of the remaining sections or parts of the grate-bar, thus eecting a large saving in the cost of repairs. Again, by providing the under side of each of the sections with a concaved arch and corrugating the tops of the sections and ends of the frame laterally and longitudinally and concaving the sides of the framebetween the sections it is possible to provide the furnace with a considerable volume of air to aid the combustion taking place within it, 'at the same time preventing the adherence of clinkers to the grate-bar.

It will be noticed by reference to the drawings that the top e of each of the gudgeons A3 is flattened.

F F represent the journal-plates, each of which is provided with a series of bearings f, thelower part of each of which is rounded to'correspond to the rounded portion of the gudgeons A3 in order that the gudgeons can rock easily'in either direction when mounted therein. Each journal-plate is provided with a series of slots f', extending inwardly from ing turned into their proper position.

means of this construction the gudgeons of the grate-bars are removably locked in the the top to the bearings f. The width of each slot is slightly less than the diameter of its respective gudgeon A3 in order that when the grate-bars are being mounted in the journalplates it will be necessary to turn them edgewise into the position shown in dotted lines lin Fig. 5 of the drawings, so that the gudgeons can move easily through the slotsf and enter the bearings f, the grate-bars then bebearings of the journal-plates.

Each of the journal-plates Fis trussed, as

`shown in Fig. 5 of the drawings, to enable it to withstand the strains placed upon it. The

` front end of the journal-plate is provided with` a dovetail f, which interlocks with a. correspondingdovetailedl groove f3, formed inthe inner face of the front support G, and are supported upon an inwardly-projecting/lug f4 at the bottom of the support Gr., By means of the dovetails f" and grooves f3 the journalplates are securely held in position.

Each of the journal-plates F intermediate the bearings f is provided with grooves or nicks g, having V-shaped tops to prevent the lodgment thereon of ashes and'cindersand to allow of the circulation. of the air-currents over the journal-plates to the fire.

The front support G, it will be noticed by reference to the drawings, is trussed ina similar manner to the journal-plates F and for the same purpose.

Connected' to the lower part of the ends' a of the grate-bars is a shaking-rod H, which projects through the front l of the boiler-casing, and connected to the front end of the rod H is a lever J, by means of which it is operated to rock the grate-bars in either direction. When it is necessary to clean the re--that is, to remove the ashes and cinders--the lever is limited to a slight reciprocating movement to rock the grate-bars sufflciently to agitate the contents of the furnace, and when it is necessary to dump. the contents of the furnace into the ash-pit the lever is moved to its fullest extent toy upset the grate-bars and allow of the fire falling through them.

By constructing the grate-bars on the above principle the furnace is provided with a sufiicient air current or draft to insure a practicallycomplete combustion, while at the same time the furnace is strongly and cheaply constructed and thoroughly durable.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

l. A grate-bar comprising a rectangular f rame havingtaperin g slots in its sides, a number of wedge-shaped cross-bars fitting within the tapering slots and provided with` parallel slots on their lower edges engaging the framevbelow the tapering slots, said cross-bars beroo IIS

ing provided with corrugated top srfaces, lower edges engaging the plates below the and suitable gudgeons formed on the ends of Joapering slots, substantially as described.

the frame substantially as described. Toronto, Canada, December 14, A. D.. 1898. 2. A grate-bar comprising two plates with HENRY TRUESDELL. 5 tapering slots therein, a number of Wedge- In presence ofshaped cross-bars tting Within the tapering M. A. WESTWOOD,

slots and provided with parallel slots on their C. H. RICHES. 

